brayncc Posted July 26, 2020 Share Posted July 26, 2020 I have a new to me motorhome with a Thetford CT 4000 cassette toilet. It was making a rattling/thumping noise whern emptied. On inspection, it is lined with a relatively rough light brown coating ( no it's not! ). It appears to be some sort of ceramic but it is breaking up and I can see the blue plastic underneath it. Is this disastrous or can it be lived with? Link to comment Share on other sites More sharing options...
Keithl Posted July 26, 2020 Share Posted July 26, 2020 Hi and welcome, How old is the MH as you only say 'new to me'? It could be limescale if it is breaking away in chunks and sheets. Keith. Link to comment Share on other sites More sharing options...
brayncc Posted July 26, 2020 Author Share Posted July 26, 2020 The van is a 2013 East Neuk Fifer. To be honest, it doesn't feel like ceramic when I handled it, it crumbled much too easily. Limescale was not on my radar but is a thought provoking alternative! Link to comment Share on other sites More sharing options...
witzend Posted July 26, 2020 Share Posted July 26, 2020 brayncc - 2020-07-26 6:15 PM I handled it, it crumbled much too easily. I wouldn't handle it any more it's a normal by product. I found after I stopped using blue an switched to bio liquid it cleared away eventually (Formil bio from lidil) Link to comment Share on other sites More sharing options...
brayncc Posted July 27, 2020 Author Share Posted July 27, 2020 I will take your advice and thanks for the answers in such a prompt and concise form. I shall stop worrying and wash my hands again! Link to comment Share on other sites More sharing options...
Derek Uzzell Posted July 27, 2020 Share Posted July 27, 2020 brayncc - 2020-07-26 6:15 PM The van is a 2013 East Neuk Fifer. To be honest, it doesn't feel like ceramic when I handled it, it crumbled much too easily. Limescale was not on my radar but is a thought provoking alternative! As has been advised above, the light brown lining is ‘scale’ that will build up over time unless a toilet cassette’s interior is kept ckean. There is plenty of on-line advice on cleaning methods https://tinyurl.com/y3ehpev8 Thetford markets a specific product https://www.thetford-europe.com/gb/products/toilet-care-products/waste-holding-tank-products/cassette-tank-cleaner or you could use a strongish citric acid solution. This 2008 forum discussion may also be of interest https://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Thetford-Cassette-Cleaning-Report-Back-/13585/ In fact, although Thetford produces a C4000 range of toilets, your Fifer probably has a DOMETIC CT4000 toilet with a ceramic inlay bowl (image of cassette attached below) - but the Thetford cleaning advice will apply equally well to Dometic toilets. https://www.frankana.de/en/dometic-ct-4000-64999.html#v_301_002 It’s perhaps also worth adding that - if there’s a rattling/thumping noise from inside the cassette when it is being emptied, something internal may have become detached. When emptying a toilet cassette, some people shake the cassette violently and internal components can fall off their mounting or become damaged. If a cassette becomes badly damaged, Dometic (and Thetford) offers a cassette 'renew kit’ that includes a new seat and can be less expensive than buying the cassette alone (sample advert here). https://www.leisureshopdirect.com/water/caravan-toilet/dometic-toilets/dometic-replacement-set-for-ct-3000-ct-4000-toilet-models Link to comment Share on other sites More sharing options...
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